2020ApJ...900...69X

Query : 2020ApJ...900...69X

2020ApJ...900...69X - Astrophys. J., 900, 69-69 (2020/September-1)

Testing ΛCDM with dwarf galaxy morphology.

XU W.L. and RANDALL L.

Abstract (from CDS):

The leading tensions to the collisionless cold dark matter (CDM) paradigm are the "small-scale controversies," discrepancies between observations at the dwarf-galactic scale, and their simulational counterparts. In this work we consider methods to infer 3D morphological information on Local Group dwarf spheroidals and test the fitness of CDM+hydrodynamics simulations to the observed galaxy shapes. We find that the subpopulation of dwarf galaxies with mass-to-light ratio ≳100M☉/L☉ reflects an oblate morphology. This is discrepant with the dwarf galaxies with mass-to-light ratios ≲100M☉/L☉, which reflect prolate morphologies, as well as simulations of CDM-sourced bright isolated galaxies that are explicitly prolate. Although more simulations and data are called for if evidence of oblate pressure-supported stellar distributions persists in observed galaxies while being absent from simulations, we argue that an underlying oblate non-CDM dark matter halo may be required and present this as motivation for future studies.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Dwarf galaxies - Galaxy dark matter halos - Dwarf spheroidal galaxies - Dark matter distribution - Hydrodynamical simulations

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
2 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
5 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
6 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
7 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 125 1
8 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
9 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
10 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
11 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
12 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
13 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
14 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
15 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
16 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
17 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
18 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
19 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
20 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
21 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
22 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
23 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
24 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
25 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
26 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
27 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
28 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
29 NAME Local Group GrG ~ ~           ~ 9325 0

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